Bluejay supports EFM8 BB MCUs which are 8Bit, 8051 compatible micro processors.

The differences between the families is listed below:

  BB10 F8 BB21 F16 BB51 F16
Flash 8KB 16KB 16KB
RAM 512B 2304B 1280B
Standard 256B 256B 256B
XRAM 256B 2048B 1024B
Clock 25MHz 50MHz 50MHz
8-bit GP Timers 0 0 2
16-bit GP Timers 4 5 4
PCA channels 3 3 3
UART 1 2 2
Analog Comparators 2 2 2

Datasheets

Reference Manuals